<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>页面结构分析</title>
</head>
<body>

<header><h2>网页头部</h2></header>
<section><h2>网页主题</h2></section>
<footer><h2>网页底部</h2></footer>


</body>
</html>
